Is there a way best suited to arrange Powerheads for a FOWLR Tank? Have a sump w filter under the tank that recieves water at the top of the tank and disperses it through "jets" at the top of the tank. Bought a Powerhead and hung it on the wall at the top of the tank recieving water inferiorly and ejecting it Perpendicular to the out put of the filter return. Purchased a third powerhead and not sure where to place it (Want more flow on the bottom without creating a Sand storm. Any suggestions? Are there standard ways to arrange Powerheads?